7978000

素因数分解:

$2^4\times 5^3\times {\mathrm{3989}}^1$

素因数の和:4012

約数の個数: 40

約数和(自身を含む): 19295640

約数和(自身を除く): 11317640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 2000, 3989, 7978, 15956, 19945, 31912, 39890, 63824, 79780, 99725, 159560, 199450, 319120, 398900, 498625, 797800, 997250, 1595600, 1994500, 3989000, 7978000]

約数ペア:

[(1, 7978000), (2, 3989000), (4, 1994500), (5, 1595600), (8, 997250), (10, 797800), (16, 498625), (20, 398900), (25, 319120), (40, 199450), (50, 159560), (80, 99725), (100, 79780), (125, 63824), (200, 39890), (250, 31912), (400, 19945), (500, 15956), (1000, 7978), (2000, 3989)]